Blender 2.8 PNG image is not transparent even with alpha blend and alpha nodes
You have to change the Blend Mode in the material settings and have to be in Rendered View.



Any of Alpha Clip, Alpha Hashed or Alpha Blend would work for a single image, but for a pixel perfect preview in EEVEE, Alpha Blend is required.


  Alpha Blending
  Use alpha blending to overlay the surface color on top of the previous color.